export interface PPDExtractStats {
    kept: number;
    skippedSAON: number;
    skippedPAON: number;
    skippedNoStreet: number;
    skippedNoPostcode: number;
}
/**
 * Convert PPD rows (`id,price,date,postcode,type,new,tenure,PAON,SAON,street,locality,town,district,county,cat,status`
 * — headerless) into OA-shaped tuple lines via `write`, applying the skip rules + title-casing. Accepts a plain array
 * of rows (tests) or a streamed async source (the real 31M-row extraction).
 */
export declare function extractPPDTuples(input: AsyncIterable<string[]> | Iterable<string[]>, write: (line: string) => void): Promise<PPDExtractStats>;
/**
 * Stream `inputPath` (PPD CSV) → `outputPath` (OA-shaped tuples CSV), returning the row-count stats.
 */
export declare function runPPDExtract(inputPath: string, outputPath: string): Promise<PPDExtractStats>;
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